Handsaw.



No. 737,458. PATBNTED AUG. 25, 1903.

R. F. E. OKRASSA. HANDSAW.

APPLIOATION FILED SBPT.13, 1902.

N0 MODEL.

W/TNESSES m: NORRIS PETER: 00,. Pnmau'rno WASHINGTON n. c,

UNITED STATES Patented August 25, 1903.

PATENT OFFICE.

HANDSAW.

SPECIFICATION forming part of Letters Patent No. 737,458, dated August 25, 1903. Application filed September 13, 1902. Serial No. 123,277. (No model.)

T at whom, it may concern:

Be it known that LRoBER'ro F. E. OKRAssA, asubjectof theEmperor of Germany and King of Prussia, residing in Antigua, Guatemala, Central America,have invented a new and Improved Handsaw, of which the followingis a full, clear, and exact description.

The object of the invention is to provide a new and improved handsaw which is simple and durable in construction, readily adjustable for accommodating saw-blades and for giving the desired tension to the saw-blade, and arranged to allow a convenient removal of a worn-out blade and insertion of a new one.

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the improvement. Fig. 2 is an enlarged face view of the blank for forming a frame-arm. Fig. 3 is an enlarged end elevation of one of the framearms. Fig. t is an enlarged plan view of one of the blade-carriers. Fig. 5 is an enlarged plan view of one of the saw-blade tighteners, and Fig. 6 is an end view of the same.

The improved handsaw is provided with a frame having a bar or shank A, made, preferably, of wood and terminating at one end in an integral handle B. On the bar A are arranged the inner and outer arms 0 0, each preferably made from a single piece of sheet metal, such as shown in Fig. 2, the single piece of metal being bent to form loops or bearings O C for the reception of the hollow shanks D, in which extend the blade-holders E, having hooks E engaging apertures F in the ends of the saw-blade F, as plainly shown in Figs. 1 and 5. Each shank D is formed with a slot D for the receipt of the end of theblade F, and each shank is provided at its outer end with a head I), resting against the outer edge of the corresponding loop 0 or C Each blade-holder E is flattened in the portion carrying the hook E, as plainlyindicated in Fig. 5, and each holder terminates at its outer end in a screw-rod E on which screws a nut E abutting against the head D Now by screwing up the nut E of one of the holders this holder is moved outward in the corresponding shank to draw the blade F taut. Each piece or blank for forming the arms 0 C has a top portion C and sides 0 united with each other at their lower ends by the loop 0* integral with one of the sides and fastened-by rivets or the like to the other side, as indicated in Figs. 1 and 3. Each blank is also provided on each side (3 with an integral flap C and the two flaps are overlapped and preferably fastened together by a rivet to form an inner end, as indicated in Figs. 1 and 3. The outer ends of the arms 0 C" are open, while the inner ends are closed by the doubled-up flaps C and consequently a very strong and durable arm is provided to allow of giving the desired tension to the saw-blade F Without danger of bending the arms. The overlapping flaps C terminate a distance below the top 0 to leave an opening for the bar A, as will be readily understood by reference to Figs. 1 and 3. To the doubled-up inner ends of each arm 0 is riveted or otherwise secured a bracket G, resting against the under side of the bar Ato reinforce the arms and to prevent the upper edge of the doubled-up ends from cutting into the material of the bar A. The arms 0 C are free to slide on the bar A when the saw-blade is disconnected to allow of moving the arms a distance apart, according to the length of the sawblade to be used. When the saw-blade is attached to the hooks E, then the operator screws the nuts E up to draw the saw-blade taut, as previously explained, it being understood that the strain exerted on the loops of the arms 0 0' tends to tilt the arms toward each other to freely move the brackets G in firm contact with the under side of the barA to hold the arms C 0' against movement.

A saw-frame constructed in the manner above set forth is exceedingly durable in construction, and as the several parts can be readily adjusted it is evident that any desired tension can be given to the saw-blade 1 or the latter can be removed when worn out and a new one substituted whenever desired.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A handsaw comprising a handled bar, arms adjustably mounted on the said bar and having loops at their free ends, headed hollow shanks in the said loops, and a bladeholder adjustable lengthwise in each shank and engaging the end of the saw-blade, as set forth.

2. A handsaw comprising a handled bar, arms adjustably mounted on the said bar and having loops at their free ends, headed hollow shanks in the said loops, and a bladeholder adjustable lengthwise in each shank and engaging the end of the saw-blade the said hollow shanks being slotted for the reception of the ends of the saw-blade, as set forth.

3. A han-dsaw comprising a handled bar, arms adjustably mounted on the said bar and having loops at their free ends, headed hollow shanks in the said loops, and a blade holder adjustable lengthwise in each shank and engaging the end of the saw-blade, each holder having a flattened portion, a hook thereon and a screw-rod and nut abutting against the head of the hollow shank, as set forth.

4. A handsaw-frame having arms, each formed of a single piece of sheet metal and bent to form a top, sides, a loop, and inner doubled-up ends, as set forth.

5. A handsaw-frame having arms, each formed of a single piece of sheet metal and bent to form a top, sides, a loop and inner doubled-up ends, the said doubled-up ends terminating a distance from the top to form a passage for the bar of the saw-frame, as set forth.

6. A handsaw-frame having arms, each formed of a single piece of sheet metal and bent to form a top, sides, a loop and inner doubled-up ends, the said doubled-up ends terminating a distance from the top'to form a passage for the bar of the saw-frame, and brackets secured'to the doubled-up ends, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

ROBERTO F. E. OKRASSA.

Witnesses:

CIRIAoo PERALTA, GREGORIO CARDOZA. 

